Java IO API实现获取路径信息并去除冗余信息

import java.nio.file.Path;
import java.nio.file.Paths;

public class PathInfoExample {
    public static void main(String[] args) {
        // 创建一个路径实例，Windows 路径格式
        Path pathWindows = Paths.get("C:\\home\\joe\\foo");
        
        // 创建一个路径实例，Solaris 路径格式
        Path pathSolaris = Paths.get("/home/joe/foo");
        
        // 打印路径的各种信息
        printPathInfo(pathWindows);
        printPathInfo(pathSolaris);
    }
    
    public static void printPathInfo(Path path) {
        System.out.format("toString: %s%n", path.toString());
        System.out.format("getFileName: %s%n", path.getFileName());
        System.out.format("getName(0): %s%n", path.getName(0));
        System.out.format("getNameCount: %d%n", path.getNameCount());
        System.out.format("subpath(0,2): %s%n", path.subpath(0, 2));
        System.out.format("getParent: %s%n", path.getParent());
        System.out.format("getRoot: %s%n", path.getRoot());
    }
}

// Solaris 路径格式
Path pathSolarisRelative = Paths.get("sally/bar");

// Windows 路径格式
Path pathWindowsRelative = Paths.get("sally\\bar");

printPathInfo(pathSolarisRelative);
printPathInfo(pathWindowsRelative);

import java.nio.file.Path;
import java.nio.file.Paths;

public class PathNormalizationExample {
    public static void main(String[] args) {
        Path path1 = Paths.get("/home/./joe/foo");
        Path path2 = Paths.get("/home/sally/../joe/foo");

        System.out.println("Original path1: " + path1);
        System.out.println("Normalized path1: " + path1.normalize());

        System.out.println("Original path2: " + path2);
        System.out.println("Normalized path2: " + path2.normalize());
    }
}

Path path = Paths.get("/home/sally/../joe/foo");
Path realPath = path.toRealPath(); // 会解析链接，并检查文件存在性